The x-rite ColorCheck Gray Card is am 8.25 x 11" version of the white, 18% gray, and black reference squares used in the 24-patch ColorChecker, all on a single card. Use it as the first reference shot to instantly correct image color by balancing on the mid-tone gray value. In the studio, use it to evaluate exposure and balance between main and fill lights to quickly set up the proper lighting ratio, and to set white balance. The ColorChecker Three-Step Grayscale target also provides reference values for adjusting colors within most common photo processing software packages, allowing you to make quick color adjustments.

You can use the Grayscale Card for a variety of applications:

Digital Photography: Check images, set white balance and verify exposure and balance between main and fill lights.